D.N. Roy is Professor Emeritus of Wood Chemistry. He has been actively involved in teaching at the University for over 25 years. His research interests include pollution effects and abatement, forest pest control, paper recycling, and waste reduction and recycling. Research Interests 1. The use of nonwood fibres for the manufacture of pulp and paper products The pulping potential of nonwood fibres has been investigated in a variety of publications and conference proceedings. The work has provided fundamental information about the response of nonwoods to established pulping processes, and about the suitability of these fibres for use in industrial-scale processes. 2. The effects of recycling on wood and nonwood fibres The multiple chemical and physical effects that recycling has upon wood and nonwood fibres have been studied extensively. The research has concentrated upon wood fibres, and in relating the recycling process with changes in paper properties and performance. These studies are now being duplicated with nonwood fibres in order to extend the knowledge base about these materials. 3. The relationship between pulp methodology and fibre quality Because different fibre sources have unique chemical properties, the pulping process used must be tailored to suit the fibre source at hand. Our research has illustrated many of the underlying relationships between the pulping method and the fibre source. Initial research investigated the links between traditional pulping methods and fibre sources. Current research has concentrated upon nonwood fibres, and upon optimising the pulping methods used to get maximum benefit from these materials. 4. The relationship between air pollution and tree health Our research has investigated the impact of fluoride emissions on tree species in southern Ontario, utilising advanced analysis techniques to detect chemical changes within the stem matrix. This research is a natural extension of investigations into the decline of sugar maple, which was observed in the early 1980’s. Eventually, our studies were able to aid in identifying climate change as the root cause of decline, which was aggravated by the high amounts of pollution in the atmosphere. Our current research focuses upon the links between MMT emissions and roadside tree health. 5. The impact of age and fibre source upon fibre quality Our studies have helped to establish relationships between the age of the tree or nonwood plant and the quality of the fibres taken from these plants. At different times, this research has investigated the bulk delignification kinetics of different-aged fibres from the same tree, the variations in quality between fibres taken from Salix clones, and the impact of age and decay upon wood fibres. Previous research initiatives have included breakthrough work in the synthesis of a fungicide to control Dutch elm disease, work which resulted in 3 patents and worldwide attention. As well, novel chemical investigations such as the use of hybrid poplar leaf protein as food supplement, have been initiated in Dr. Roy’s laboratories. Refereed journal publications (last five years): In Press Liu, X.A., Whiting, P., Pande, H. and D.N. Roy. 2000. The contribution of fines, colloidal and dissolved materials to pulp drainage in mechanical pulps. J. P. Paper Sci. Karakus, S., Roy, D.N., and K. Goel. 2000. Chemistry and soda pulping properties of kenaf as a function of growth. J. Wood Chem. Tech. McLaughlin, D.L. and D.N. Roy. 2000. Dendroecological study of nine tree species exposed to hydrogen fluoride emissions from an aluminum smelter. Can. J. For. Res. Published Bhuie, A., McLaughlin, D.L., and D.N. Roy. 2000. Exposure of urban ecosystems to Mn and Pb contaminants from gasoline additives beside a major highway in the Greater Toronto Area, Canada. For. Chronicle 76(2): 251-258. Mohta, D., Roy, D.N., and P. Whiting. 2000. Refiner mechanical pulping of kenaf bast fibre. Pulp Paper Can. 101(8): 213-217. Pande, H., Roy, D.N. and S. Kant. 2000. Tear and tensile properties of soda pulps from kenaf bast fibres. Tappi J. 83(6): 47. Lohrasebi, H., Mabee, W.E. and D.N. Roy. 1999. Chemistry of kraft pulping of compression wood in Black spruce. J. Wood Chem. & Tech. 19(1&2): 13-25. Mabee, W.E. and D.N. Roy. 1999. Novel nonwood fibre sources to offset forest degradation and contribute to environmental preservation. J. Indian Chem. Soc. 76(6): 707-712. Mohta, D. and D.N. Roy. 1999. Forests, fibre and the environment. Forestry Chronicle 75(3): 247-255. Pande, H., N.J. Rao, S.K. Kapoor and D.N. Roy. 1999. Hydrodynamic behaviour of non-wood pulp suspensions. Tappi J. 82(6): 141-145. Vishnevetskaia, K. and D.N. Roy. 1999. Oxidative stress and antioxidative defence with emphasis on plants antioxidants. Environmental Reviews 17: 31-51. Bell, R.L., Graham, A.K., and D.N. Roy. 1998. The significance of air pollution in sugar maple decline. Forestry Chronicle 74(4): 530-533. Correia, F.M.C., Goel, K. and D.N. Roy. 1998. Pulping of Canadian industrial hemp (Cannabis sativa L.). Pulp Paper Can. 99(9): 39-41. Mohta, D., Upadhyaya, J.S., Kaporr, S.K. Ray, A.K. and D.N. Roy. 1998. Oxygen delignification of soda and soda AQ bagasse pulps. Tappi J. 81(6): 184-187. Pande, H. and D.N. Roy. 1998. Influence of fibre morphology and chemical composition on the papermaking potential of kenaf fibres. Pulp Paper Can. 99(11): 31-34. Takar, A.A., McLaughlin, D.L., and D.N. Roy. 1998. Chemical changes in the stem matrix of three tree species exposed to fluoride emissions from an aluminium smelter. Forestry Chronicle 74(1): 78-82. Mohamed, H.K., Pathak, S., Roy, D.N., Hutchinson, T.C., McLaughlin, D.L., and J.C. Kinch. 1997. Relationship between Sugar maple decline and corresponding changes in the stem tissue. J. Air Water Soil Pollution 96: 321-327. Pande, H. and D.N. Roy. 1996. Delignification kinetics of soda pulping of Kenaf. J. Wood Chem. & Tech. 16(3): 311-325. Singh, S. and D.N. Roy. 1996. The effects of recycling on the chemical properties of thermomechanical pulp. J. Wood Chem. & Tech. 16(4): 421-437. Books & Monographs Mabee, W.E. and D.N. Roy. 2000. Chemicals from Wood. In The Encyclopedia of Materials: Science and Technology. Oxford, UK: Elsevier Science Ltd. (In press). Mabee, W.E. and D.N. Roy. 1999. Fuelwood – an overview. Monograph (In press). Pande, H. and D.N. Roy. 1999. Recycling potential of kenaf fibres. Monograph, International Kenaf Society, under the Auspices of the American Chemical Society. Kenaf Properties, Processing and Products. Mississippi State University Press. Honours Charles Bullard Fellow, Harvard University Full Member, New York Academy of Science Invention Award Fellow, Royal Institute of Chemistry Fulbright Fellow, Fulbright Foundation
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